Pruning old directories/ready files.
Pruning old directories/ready files.

Bug: 943696
Change-Id: I7732688ae28ccc9a917c32d139b53066d24c043d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1592563
Commit-Queue: Karen Qian <cca779e1ec38fb5b6daaa25edee84281b543e630@google.com>
Reviewed-by: Andrii Shyshkalov <a30c74fa30536fe7ea81ed6dec202e35e149e1fd@chromium.org>

CoherentLabs/depot_tools,CoherentLabs/depot_tools